Try 78: https://www.cdc.gov/nchs/fastats/life-expectancy.htm

Obviously not everyone reaches that. Even if you set the retirement age at 50, some people would die first.

Yes,

But also, perhaps superannuation being (at least here in NZ) not means tested and larger than all other welfare combined implies there is a problem.

It means more tax take and less superannuation spending. Depends on the country’s superannuation system, of course.

That means more money available for all the things taxes are used for, many of which are very very necessary.

How can you justify cuts to the healthcare system because you claim to not have enough money, but then pay pensioners some thousand dollars a fortnight, regardless of what assets or other income they have?